Busou Shinki: Armored War Goddess (2012)

After years abroad, high school student Masato finally returns to Japan. On his first morning back, his Arnval Shinki, Ann, wakes him up. As he rushes to get ready, two more Shinki emerge from their neatly packed boxes—Ines, an Altines model, and Lene, an Altlene model. Eager to help their Master, they dive into cleaning and organizing his belongings. Then they stumble upon a box marked "Valuable." What secrets does it hold?